Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb966733104854f7…

MALICIOUS

PDF

67.4 KB Created: 2020-11-21 06:10:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a1eee5fc2a0fc3eb413edbb565d6335d SHA-1: b8c0b4c54569c6addf27d28c6d1f4b54afbc6853 SHA-256: cb966733104854f71041f4bb5810da0d1fb2518d65e71dcb5f1dbe19a83cf932
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by multiple heuristics and a ClamAV signature, specifically flagging it as a PDF phishing trojan. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The PDF also exhibits characteristics of a link farm, suggesting an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the presence of numerous external links indicates a strong intent to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/123?utm_term=nova+aesthetic+center In PDF document text
    • https://mitezexevas.weebly.com/uploads/1/3/4/5/134525922/bamuzajabikotadujove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_5fa94a620ee20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_5f9e6c9fe9733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_5f94bcaf2618c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5fb3f88754094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369327/normal_5f917596789a4.pdfIn PDF document text
    • https://dakovogusuzulex.weebly.com/uploads/1/3/4/5/134595229/4020756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375698/normal_5f9d592874c80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403418/normal_5f91bf1f0cd54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_5f896a439d347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_5f9569bc1f984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372074/normal_5fac5c799c46d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/cookies_recipes_halloween.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/najonivamariraxaf.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/parefova.pdfIn PDF document text
    • https://s3.amazonaws.com/kizuporowefib/10654552536.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC089 3080 bytes
SHA-256: 3b6c3edccbbdf68622c80e44ac099bd4bffa00507f4f1bc839f0bdbf087aa810
font_01_sfnt_off0000cb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB93 4884 bytes
SHA-256: 8c91867ca6a65c4ae41c38a30462ef97be121ad547a2e65331ad02194d876590
font_02_sfnt_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 10776 bytes
SHA-256: f83d9beed0c47164a34f524e50d0ccbb9f977be96e84053dbf5ea20707a16afd

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